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6h
revised $\operatorname{Fr}( p(\overline U) )$ where $p : X \to Y$ is a closed, not necessarily continuous, surjection, and $U \subset X$ is open
added 40 characters in body; edited tags; edited title
20h
revised Given n girls and boys how many ways are there to arrange them such that any two boys have atleast 'k' girls between them.
example appears to be for K=3 (at least K girls between any two boys)
23h
revised Krull's height theorem in the non-Noetherian case
added 69 characters in body; edited tags; edited title
1d
revised Proving $ \neg ( \neg \alpha \wedge \neg \neg \alpha )$
deleted 136 characters in body
1d
comment Vector spaces whose elements are functions
Comments are not for extended discussion; this conversation has been moved to chat.
2d
revised Dirichlet integral using real Analysis
appended answer 1250840 as supplemental
2d
answered $X$ is A-space iff the frontier of any closed set in $X$ is compact.
2d
comment Pos of Matrix is a closed set?
@H.Reza If that's what you want to do just fill out the form here.
2d
comment Pos of Matrix is a closed set?
@H.Reza It is quite bad form to simply delete a closed question, and then re-ask it without any changes. If you continue to do this very bad things may happen. (Please read that last part in an ominous voice, as intended.)
2d
comment If the sum of $n$ terms of an A.P. is $2n+3n^2$, find the $r^{th}$ term.
The original Solutions of the Examples in Higher Algebra is available from the Internet Archive in a variety of formats. See here.
Apr
24
comment Finding minimum value of a trigonometric expression
That the exact same answer provides a solution to two different questions is an indication that one should probably be closed as a duplicate of the other.
Apr
24
revised $X$ is A-space iff the frontier of any closed set in $X$ is compact.
added 45 characters in body; edited tags
Apr
23
revised Verifying $(A \bigtriangleup B) \cup C=(A \cup C) \bigtriangleup (B\setminus C)$
added 3 characters in body; edited tags; edited title
Apr
23
revised Is there a metric proof for the Caristi theorem?
fixed formatting
Apr
22
revised Closure, interior, boundary and exterior of $A = (-\infty, 1) \cup [2, \infty)$ as a subset of $\mathbb R$ with the half open line topology
Sorgenfrey
Apr
22
revised Closure, interior, boundary and exterior of $A = (-\infty, 1) \cup [2, \infty)$ as a subset of $\mathbb R$ with the half open line topology
added 52 characters in body; edited tags; edited title
Apr
22
revised Compute $f(2)$ if $\int_0^{x^2(1+x)} f(t) dt = x$ for all $x \geq 0$
added 9 characters in body; edited title
Apr
22
revised Compute $f(2)$ if $\int_0^{x^2(1+x)} f(t) dt = x$ for all $x \geq 0$
added 9 characters in body; edited title
Apr
22
revised Dirac delta question from “Classical covariant fields” by Burgess
MathJaxified equations
Apr
22
revised $x \perp y$ if and only if $\Vert x + \alpha y \Vert \ge \Vert x \Vert$ for all scalars $\alpha$
more descriptive title